Unfortunately that is not possible. It might be possible to drill a hole through the led-ring for the camera to see through or connecting a neopixel ring similar to what we once did on the CF-nano. However the light from the leds might fool the optical flow sensor when it is close to the ground though. Would be fun to test!

Operationally, I have a question - the Flow deck uses the LeftExpansion7 (IO_2) pin and so does the LED Deck for the serial data for the WS2812B LEDs (labelled on the schematic as PWM_DOWN). How does that pin overloading work?

Huh... then how does the firmware handle it?
When the drivers for the flow deck and ring deck are enabled, IO_2 is still overloaded in the firmware right?
That is, the ring deck will output a PWM on the line, and the flow deck driver will implement the RESET/MOTION logic?

The resistors to IO_2 are marked "NM" which means Not Mounted. I guess we can add some textual explanation on future schematic to mark clearly that these are intended to be not populated out of the box.